Augmented reality display device

1. An HMD-type device for displaying an image in augmented reality, comprising: an assembly of light display pixels arranged on a first surface of a transparent support intended to be positioned on the optical path between a user's eye and a real scene to be observed, this assembly comprising a number N greater than 1 of pixel sub-assemblies, each comprising a sufficient number of pixels to display the entire image; and an optical system arranged on a second surface of said support opposite to the first surface, this system comprising N optical sub-systems, each pixel sub-assembly facing one of the optical sub-systems, wherein number Q of optical sub-systems, in a given direction parallel to said support, is at least equal to the integer greater than value e/f, where e designates the optical path between the optical system and a user's eye, and f designates the focal distance of the optical sub-systems.

2. The device of claim 1 , wherein, in front view, neighboring optical sub-systems are contiguous.

3. The device of claim 1 , wherein the pixels are non contiguous and the space between pixels is compatible with the visualizing of a real scene in transparency through the support.

4. The device of claim 1 , wherein in top view, each pixel is placed in a central portion of a surface free of any other pixel, so that the surface area of the support effectively occupied by the pixels does not exceed 20 percent of the total area of the surface of the support having the pixels arranged thereon.

5. The device of claim 1 , wherein, at a given time, only a portion of each pixel sub-assembly, visible with the eye from a determined eye box, is activated.

6. The device of claim 5 , wherein said portion has a dimension of approximately f*(Len+B)/e, where f is the focal distance of the corresponding optical sub-system, Len is the diameter of the corresponding optical sub-system, B is the dimension of the eye box, and e is the optical path between the optical system and the eye.

7. The device of claim 6 , further comprising an eye tracking device enabling to know, at any time, the relative position of the user's eye with respect to the display device, and a control circuit capable, in each pixel sub-assembly, of activating or deactivating pixels according to the detected eye position.

8. The device of claim 1 , wherein each pixel sub-assembly extends over a surface substantially equal to that of the optical sub-system in front of which it is located.

9. The device of claim 1 , wherein each sub-assembly contains a sufficient number of pixels to display an image of approximately 320 by approximately 240 pixels.

10. The device of claim 1 , wherein the pixels of said pixel assembly are arranged in an array and regularly distributed over the entire surface of the support.

11. The device of claim 1 , wherein the pixels are formed in OLED technology.

12. The device of claim 1 , wherein said pixel assembly is in an object focal plane of the optical system.

13. The device of claim 1 , wherein said support is a transparent plate having a thickness smaller than or equal to 3.5 millimeters.

14. The device of claim 1 , wherein said optical system is made in the form of a reflective hologram.

15. The device of claim 1 , having the general shape of eyeglasses or of a mask.

16. The device of claim 1 , wherein the optical sub-systems are all substantially identical, dimension Len, in a given direction parallel to said support, of an optical sub-system, being approximately equal to value Q*f*Len/e, where Q is the number of optical sub-systems in said direction, f is the focal distance of said optical sub-systems, and e is the optical path between the optical system and a user's eye.

17. An HMD-type device for displaying an image in augmented reality, comprising: an assembly of light display pixels arranged on a first surface of a transparent support intended to be positioned on the optical path between a user's eye and a real scene to be observed, this assembly comprising a number N greater than 1 of pixel sub-assemblies, each comprising a sufficient number of pixels to display the entire image; and an optical system arranged on a second surface of said support opposite to the first surface, this system comprising N optical sub-systems, each pixel sub-assembly facing one of the optical sub-systems, wherein, at a given time, only a portion of each pixel sub-assembly, visible with the eye from a determined eye box, is activated, wherein said portion has a dimension of approximately f*(Len+B)/e, where f is the focal distance of the corresponding optical sub-system, Len is the diameter of the corresponding optical sub-system, B is the dimension of the eye box, and e is the optical path between the optical system and the eye.

18. The device of claim 17 , further comprising an eye tracking device enabling to know, at any time, the relative position of the user's eye with respect to the display device, and a control circuit capable, in each pixel sub-assembly, of activating or deactivating pixels according to the detected eye position.

19. The device of claim 17 wherein number Q of optical sub-systems, in a given direction parallel to said support, is at least equal to the integer greater than value e/f, where e designates the optical path between the optical system and a user's eye, and f designates the focal distance of the optical sub-systems.

20. An HMD-type device for displaying an image in augmented reality, comprising: an assembly of light display pixels arranged on a first surface of a transparent support intended to be positioned on the optical path between a user's eye and a real scene to be observed, this assembly comprising a number N greater than 1 of pixel sub-assemblies, each comprising a sufficient number of pixels to display the entire image; and an optical system arranged on a second surface of said support opposite to the first surface, this system comprising N optical sub-systems, each pixel sub-assembly facing one of the optical sub-systems, wherein the optical sub-systems are all substantially identical, dimension Len, in a given direction parallel to said support, of an optical sub-system, being approximately equal to value Q*f*Len/e, where Q is the number of optical sub-systems in said direction, f is the focal distance of said optical sub-systems, and e is the optical path between the optical system and a user's eye.